package reggie.filter;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import reggie.common.BaseContext;
import reggie.common.R;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取请求的uri
        String requestURI = request.getRequestURI();
        //2.不需要处理的请求路径
        String[] urls = new String[]{"/employee/login", "/employee/logout", "/backend/**", "/front/**","/common/**",
        "/user/sendMsg","/user/login"};
        //3.判断路径是否需要处理
        boolean check = check(urls, requestURI);
        if (check) {
            filterChain.doFilter(request, response);
            return;
        }
        //4-1.判断是否完成登录
        if (request.getSession().getAttribute("employee") != null) {
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request, response);
            return;
        }
        //4-2.判断是否完成登录
        if (request.getSession().getAttribute("user") != null) {
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }
        //5.未登录，通过输出流向客服端输出响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("拦截到请求: {}", request.getRequestURI());
    }

    /**
     * 路径匹配
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String urls[], String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }

        }
        return false;
    }
}
